Details of the crash were not immediately available, according to Thomas Wright, a dispatcher with the Pitkin County Sheriff’s Office.

Ginny Dyche, a spokeswoman for Aspen Valley Hospital, said the facility admitted two patients who were involved in the crash. She said they were still being evaluated, but she declined to release any other information.

It was not immediately clear how many people were on board the aircraft, which a Federal Aviation Administration spokesman said appeared to be a Bombardier Challenger 600, a midsized private jet.

FAA spokesman Allen Kenitzer said the plane was headed from Tucson, Ariz., and crashed upon landing.

Attempts by The Associated Press to reach airport officials in Colorado and Arizona were not immediately successful.

Aspen is located in the Rocky Mountains about 100 miles southwest of Denver.